Line item editor issue, where contribution Total Amount includes the Tax amount twice
Issue Description: When creating a membership the total amount shown on the line editor section is adding the tax amount twice as you can see here - https://nimb.ws/lMASmR
Replication Steps: https://nimb.ws/AfUNvV
Environment: Tested on clean CiviCRM v5.7.5 and Line Item Editor v2.0.
Recording this here as think this extension should be part of core. Please let me know thoughts?